/in/foo.cc: In function 'int A(int, int)':
/in/foo.cc:15:9: warning: 'max' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return max;
         ^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:37:16: warning: 'max' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<A(a,b)<<"\n"<<B(a,b);
                ^~~~